package train48days;


import java.util.Scanner;

public class 完全数计算 {
    public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            while (sc.hasNext()) {
                int n = sc.nextInt();
                int count = 0;
                for (int i = 1; i <= n; i++) {
                    int sum = 0;
                    for (int j = 1; j < i; j++) {
                        if (i % j == 0) {
                            sum += j;
                        }
                    }
                    if (sum == i) {
                        count++;
                    }
                }
                System.out.println(count);
            }
        }
    }
